angular leaf spot of tobacco

例句：

1. 1. The tobacco farmersin the region are facing a serious threatfrom the angular leaf spot of tobacco.
   该地区的烟草农民正面临着烟草叶角斑病的严重威胁。
2. 2. The disease hasbeen identified as a major cause of yieldloss in tobacco production.
   该疾病已被确认为烟草生产中的主要减产原因。
3. 3. Theangular leaf spot of tobacco is a complexdisease that requires specialized treatment.
   烟草叶角斑病是一种复杂的疾病，需要专门的治疗。